Sound-box and mounting therefor.



T. H. MACDONALD. SOUND BOX A ND MDUNTING THEREFOR.

APPLICATION FILED JULY l, 1909.

Patented A401221, 1914.

s?" f 55mm/vbo@ ffl/@MMM a s@ MMM@ UNITED STATES PATENT oEEIoE.

THOMAS H. MACDONALD, OF BRIDGEPORT, CONNECTICUT, A SSIGNOR TO AMERICAN;GRAPHOPHONE COMPANY, OF BRIDGEPORT, CONNECTICUT, A CORPORATION 0F WESTVIRGINIA.

SOUND-BOX AND MOUNTING THEREFOR.

Patented Apr. 21, 19.14

Application led July 1, 190g. Serial No. 50554.59. j

To all whom it may concern Be it known that I, THOMAS H. MACDON theUnited States of America, and va .residentv ,of Bridgeport, Comiecticut,have invented- ALD, a citizen of Faireld county, a new and use-fulImprovement in Sound- Boxes and Mountings Therefor, which improvement isfully set forth in the following specification.

This invention relates to talking-machines, particularly the type forcarrying a disk record with lateral undulations. y

The invention comprises an improved conf struction of sound-box and animproved manner of mounting it, preferably upon the well-knownhorizontally-swinging hollow arm that connects with the flaring horn..

The invention consists further in certain details that will be pointedout and claimed.

The invention will be best understood by reference to the annexeddrawings that form a part of the specification.

In the drawings, Figure 1 is a side elevation of the sound-box and armattached to a machine. Fig. 2 is a top view of the sound-box and the armon whichit is mounted. lFigsl 3 and 4 are details on a larger scaleshowing respectively the adjacent facesi of the sound-box and of the endof the arm. Fig. 5 is a transverse section, through the line V-V of Fig.2., Fig.`6 is a. detail showing the manner of securing the stylus-bar tothe' sound-box.

In the drawings, 1 represents the cabinet of an ordinary'disktalking-machine, having the standard 2 that carries the horn 3, andlikewise the hollow arm or tone arm 4, which is preferably mounted toswing in only a horizontal plane. The sound-box is mounted detachablyupon the free end of this arm, and has axial play thereon. This free endof the airn 4 is provided with an elbow lying in the same horizontalplane, and presents at 5 a face parallel to the diaphragm of thesound-box. The soundbox G is mounted upon this portion 5 by a bayonetjoint, and is capable of axial movement thereon to permit readysubstitution of fresh"reproducilig-needles.

The preferred form of sound-box 6 is composed of a single part having infront the circul :l1-flange forming a cavity and having theoverhangiuglip 7., und an annular' groove around the bottom of thecavity; having likewise the `for suppo'rtinghthe 'stylus-bar; andlikewise the tubular extension 9 "at its'l rear. In this tubularextension is provided the female member of the bayonet joint, consisting0i the comparatively shallow straight entrance portion 10, the deeperannular portion 11- and at the end of the latter the seat 12 (which isstill deeper). .A small rubber tube 13 is seated as a gasket 'in theannular groove in the cavity; the diaphragm 14 is inserted within thecavity and rests upon this gasket 13; and asimilar rubber-tubing 15 isintroduced beneath the lip 7 the two gaskets securing the `diaphragm inplace as shown. The stylus-bar 16 has fast thereto the usual transversespring-wings that are secured to the ears 8.

aluminum or other metal; its central portion is composed ofv a pluralityof concentric circular corrugations 17, from which extend a plurality ofradial corrugations 18, which the disk gaskets).. f

The bore in the hollow arm 4 is, at 5, adapted to receive snugly thetube 9 at. the back of the Sound-box. Projecting into this bore is astud19, which constitutes the male member of' the bayonet-joint. By makingthis stud a Vspring-pressed plunger, and providing it with a taperedtip, it will be forced into and out of the deep seat 12, to lock thesound-box in operative position (Fig. 1), and will prevent accidentalremoval of the entire sound-box when the stud is opposite the shallowstraight po-rtion 10. Preferably this stud 19 is located in a chamberpassing'radially through the wall of face 5; and it is provided With areduced portion 20 in whichfitsl the slotted end of a spring 21 to forcethe stud inward. The face 5 of the tube is cut away to receive thespring 21.

The annular portion 11 of" the bayonet joint on the sound-box 6preferablyextends nearly three-quarters of the way around the tube 9.The bayonet joint is so4 arranged that when the plunger 19 is engaged inseat 12 the stylus will be in the operative posi- (where it is engagedby the tion shown in Fig. 1; and when it is deusual perforated ears-8gradually diminish to the outer margin of- The diaphragm 14 ispreferably a disk of l sired to remove the needle and substitute a freshone, the sound-box 6 can be turned axially so as to bring the needleuppermost,

as indicated .by dotted lines 22 in Fig. 1. Preferably the spring-wings23 of the stylus-bar are secured to the sound-box under tension. Betweeneach Wing 23 and the ad- I' jacent shoulder 8 is interposed a collar 24having its outer end cupped out. Each screw that secures the wing to theshoulder is provided beneath its head with a conical parts of theinvention may be used to the -\exc"lus1,o`n of other parts, withoutdeparting fromthe'spirit of my invention.

Having thus described my invention, I claim: l

In a sound-box for talkingmachines, the combination of the casingcontaining the diaphragm, the stylus-bar therefor connected tov saiddiaphragm, and carrying a transverse spring-plate perforated at eachend, a sleeve cupped at its outer end and located lbetween' each end ofsaid spring-plate and said casing, and a screw passing througheaclrgaeroration and sleeve into said casing randfhaving beneath itshead a conical surface.

In testimony whereof I have signed this specification in the presence oftwo subseribing' Witnesses.

THOMAS H. MACDONALD. Witnesses:

A. B. KEoUGH, L. B. NICHOLSON.

Copies oi this patent may be obtained for five cents each, by addressingthe Commissioner ot Patents,

Washington, '.D. -0

